Gate-valve



'2 Sheets-Sheet 1.

J. GALVIN.

GATE VALVE.

(No Model.)

No. 415,776. Patented Nov. 26, 1889.

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(Np Model.) 2 Sheets-Sheet 2.

J. GALVIN.

GATE VALVE. No. 415,776. Patented Nov. 26, 1889.

7 602 i) I E173- JI ZYWESSES w @Wf UNITED STATES PATENT ()FFI c JAMESGALVIN, OF DETROIT, MICHIGAN.

GATE-VALVE.

SPECIFICATION forming part of Letters Patent No. 415,776, dated November26, 1889.

Application filed November 10, 1888. Serial No. 290,424- No model.)

To all whom it may concern.-

Be it known that 1, JAMES GALVIN, a citizen of the United States,residing at Detroit, county of \Vayne, State of Michigamhave invented acertain new and useful Improvement in Gate-Valves; and I do declare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it pertains tomake and use the same, reference being had to the accompanying drawings,which form apart of this specification.

My invention relates to that class of gatevalves whereinswingingwedgesriding against inclined ledges on the case are therebyforced laterally between the disks to force the disks to their seats.

Difficulty has heretofore been experienced in the use of this class ofvalves, from the :fact that when the valve is laid on its side theupperwedge will drop down between the disks, and in attempting to seatthe latter the wedge will bind and thus prevent the disks from coming totheir proper seats.

It is the object of my invention to remedy this by formin one of thewedges integral or rigid with the yoke from which the wedges and disksdepend. The other wedge is suspended or swung from the yoke.

In the drawings, Figure 1 is a sectional view showing parts inelevation. Fig. 2 is a sectional side elevation from a side at rightangles to Fig. 1. Fig. 3 is a horizontal sectional view through thedisks; and in Fig. a is shown a vertical and horizontal section of avariation.

In the above drawings, A represents the valve-case, having the inclinedledges a a'on the inner surface.

B is the valve-stem, provided at its lower end with screw-threads b.

O is a yoke provided with screw-threads c, said yoke being adapted totravel on the stem B.

(l is a wedge formed integral or rigid with the yoke C, and O is acorrespondin gly-shaped wedge suspended from the opposite side of theyoke by means of the hook c, engaging with the ear 0 011 the wedge 0 u Dare disks suspended from the yoke O by the projections 0 engaging in theears (Z of the disks, said disks being provided with i11- clinedsurfacesd, against which the inclined faces 0 of the wedges are adaptedto hear.

The operation of the valve will be readily understood. The stem B, beingsupported in the case A, is rotated, and the yoke C, with the disks andwedges, is lowered. The wedges O and C are tapered, and the edges 0coming in contact with the inclined ledges a a" on the case, the wedge Cwill be gradually forced inward as it is lowered, while the wedge C,presenting its inclined surfaces 0 to the inner surfaces of the disks,will prevent the latter from being forced laterally by the pressure ofthe wedge O and insure the perfoot seating of the disks. by thus forcingthe wedge (J inwardly the disks will be gradually forced out untilseated. The wedge 0, being formed integral or rigid with the yoke, willpermit of the valve being laid on its side and still be as easilyoperated as when in a perpendicular position, since the wedge O is notpermitted to drop down between the disks, being held in proper positionby the yoke. \Vhen an inclined projection is used on the case back ofthe rigid wedge, the latter is so formed on the yoke It will be seenthat that it will not come to a bearing on said projection until thedisks have been forced to their seats by the movable wedge. Thisprojection therefore acts simply as an abutment for the rigid wedgeafter the disks have been seated, and tends in no way to crowd the rigidwedge inward. If desired, the back of the rigid wedge C may be madestraight, as at O and the case itself serve to form an abutment againstwhich it may impinge while the swinging wedge is forcing the disks totheir seats. This form is shown in the two views of Fig. 4. When thislatter construction is used, the rigid wedge may be open at the back, soas to straddle the ledge a on the case, as shown by the lower View ofFig. 4 and by the dotted lines in the upper View of Fig. 4. This isdoneso that should the wedges and disks be removed from the case thepositions of the wedges may be reversed, if desired, and the valve yetbe operative.

What I claim is- 1. In a gate-valve, the combination, with thevalve-case having interior ledges aa, of

a yoke threaded upon the valve-stein and carrying the valve-disks, saidyoke provided with onerigid or integral wedge depending therefrom, andone swinging wedge suspended therefrom, said latter wedge adapted to beforced laterally between the disks by impinging against the adjacentledge, and said rigid wedge adapted to impinge against the oppositeledge, as described, and serve as an abutment, substantially asdescribed.

2. A gate-valve consisting of a valve-case and threaded stein, a yokebearing two Valvedisks, said yoke provided with two depend-v ing wedgesbetween the disks, one swinging and the other rigid, an inclinedprojection on the case adapted to engage the swinging wedge, and aprojection on the case adjacent to the back of the rigid wedge,substantially as described.

In testimony whereof I signthis specifica- 20 tion in the presence oftwo witnesses' JAMES GALVIN.

Titnesses:

M. B. .ODOGHERTY, SAMUEL E. THOMAS.

